KR20070106280A - Noise removing method for touch panel - Google Patents

Abstract

A noise removing method for a touch panel is provided to prevent bumping which appears when moving with the touch panel pressed and to prevent bumping which appears at touch-on or touch-off moments. A noise removing method for a touch panel includes the steps of: inputting X and Y coordinates when a touch panel is touched; regarding a value as a bumping touch value when an absolute value(X1-X2) is larger than a reference value x, or an absolute value(Y1-Y2) is larger than a reference value y; checking if the bumping appears successively by increasing an except value when a bumping touch value appears; measuring effectiveness by setting X=0 or Y=0 when the except value is 2; and ignoring the touch value when the except value is 1 as the bumping is generated once.

Description

Touch panel noise reduction method {NOISE REMOVING METHOD FOR TOUCH PANEL}

1 is a block diagram of a touch panel noise removing method according to the present invention.

2 is a flowchart of a touch panel noise removing method according to the present invention.

<Explanation of symbols for main parts of the drawings>

10: touch panel 15: controller

20: CPU

The present invention relates to a touch panel noise removing method, and more particularly, to a touch panel noise removing method for preventing an input error of a coordinate value generated due to a weak noise or a force pushing a touch panel.

Conventional touch panel systems appear to press the wrong position regardless of where it is pressed when pressed without enough force on the touch panel, and even when the panel is pressed with force, when pressed (touch on) and when released (touch off) ) The wrong touch value may appear. In this case, the place pressed and the other place may be input as a coordinate value.

The present invention is to overcome the above-mentioned conventional problems, the object of the present invention is that the user can press the touch panel and move no matter how fast it moves in 1 ~ 2 ms, there is a limit to the distance, the touch value immediately read If you read the touch value again and compare the two values, the difference in the value when actually pressed is small, but when the wrong value comes out while pressing or releasing the touch panel, the touch panel removes the error signal by using the difference. The present invention provides a method for removing noise.

As an example of a touch panel noise removing method according to the present invention,

Inputting the X coordinate and the Y coordinate when the touch panel is touched,

Reading the X and Y coordinates again within 1-2 ms,

Comparing an absolute value (X1-X2) and an absolute value (Y1-Y2) with a reference value _x and a reference value _y;

If the absolute value (X1-X2) is larger than the reference value _x or the absolute value (Y1-Y2) is larger than the reference value _y, the step of checking, by increasing the Except value, checking whether the continuous splashing phenomenon occurs;

If the Except value is 2, two consecutive bounces have occurred; setting 'X = 0' or 'Y = 0',

If the absolute value (X1-X2) is less than the reference value _x or the absolute value (Y1-Y2) is less than the reference value _y, Except = 0, and the X and Y coordinate values are converted to X2 and Y2 coordinate values, respectively. Setting up,

If the Except value is 2 and you set 'X = 0' or 'Y = 0', or if Except = 0 and the X and Y coordinate values are set to X2 and Y2 coordinate values, respectively, then "x_low <X <x_high and determining that y_low <Y <y_high ", x_low and y_low are taken as 0 or more test values, and x_high and y_high are used as 255 or test as appropriate values,

If it is within the validity measurement range "x_low <X <x_high and y_low <Y <y_high", the touch-on / moving process is determined by the touch-on state, the sleep is maintained for a predetermined period of time (131), and the touch value is input again to receive the routine. It is repeated, and if it is not within the validity measurement range "x_low <X <x_high and y_low <Y <y_high", it is determined that the touch off.

When the Except value is 1, it is determined that the popping phenomenon occurs once, and the touch value does not exist at the end of the routine.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

Referring to FIG. 1, four signals are connected between the touch panel 10 and the controller 15. When the user presses a point on the touch panel 10, the controller 15 converts the value of the corresponding coordinate into digital and transmits the digital data to the CPU 20.

Referring to FIG. 2, when a touch is made in the touch panel 10, X coordinates and Y coordinates are input (101, 103).

Then read the X and Y coordinates once again within 1-2 ms (105, 113).

Even if the touch panel 10 is pressed and moved quickly, the difference between the first and second coordinate values of the X coordinate or the Y coordinate within 1 to 2 ms is determined to be a normal touch only within a predetermined reference value _x or _y.

However, if the force is not sufficiently applied while pressing and moving the touch panel 10, an incorrect coordinate value is input. Since this is a bouncing value, this value is significantly different from the original coordinates. That is, it becomes a value larger than predetermined reference value _x or _y. In this respect, if the absolute value X1-X2 is greater than the reference value _x (107), or if the absolute value Y1-Y2 is greater than the reference value _y (115), this is a bouncing touch value.

When the bouncing touch value comes out, it is checked whether the bouncing phenomenon occurs continuously by increasing the Except value, which is a detected number of occurrences of the bouncing value (109, 117). If the Except value is 2, two consecutive splashes are observed. The value of 'X = 0' or 'Y = 0' is set (110, 119) to measure the validity of the X value or the Y value. Validity here is to distinguish the touch on / touch off state.

On the other hand, if the absolute value (X1-X2) is smaller than the reference value _x (107), or if the absolute value (Y1-Y2) is smaller than the reference value _y (115), this is a true touch value.

Then there will be Except = 0 with no bouncing (121).

Then, the X and Y coordinate values are set to X2 and Y2 coordinate values, respectively (123).

Then, the validity measurement is made again.

The validity measurement method should fall within the range "x_low <X <x_high and y_low <Y <y_high" (125), where x_low and y_low are taken as zero or more test values. x_high and y_high are 255 or a test value that is appropriate.

If it is within the validity measurement range "x_low <X <x_high and y_low <Y <y_high" (125), it is determined to be in the touch-on state and the touch-on / moving process is carried out (127), and the sleep is kept for a predetermined period of time (131) again. It accepts touch value input and repeats the routine. If it is not within the validity measurement range "x_low <X <x_high and y_low <Y <y_high" (125), it is determined as touch off (129).

If the panel is not touched in the normal state, the X and Y values will be “0” or “256” in 8 bits, and may be tested and used as appropriate when considering noise.

If the Except value is 1 (109, 117), it is determined that the popping phenomenon occurred once, so in this case, it is assumed that the touch value was not present at the end of the routine. The reason for this is to prevent the phenomenon that the touch is turned off and then touched on again when a touch is bounced while pressing the touch panel 10 quickly. However, if the touch is actually quickly turned off and then touched on again, the phenomenon of touch on may occur.

The touch panel noise removing method according to the present invention can prevent a popping phenomenon appearing while moving while holding the touch panel, and also prevent a popping phenomenon that may occur when the touch is pressed and the touch-off moment and the touch-on moment.

What has been described above is only one embodiment for implementing the touch panel noise removing method according to the present invention, and the present invention is not limited to the above-described embodiment, and as claimed in the following claims, the present invention Without departing from the gist of the present invention, those skilled in the art to which the present invention pertains to the technical spirit of the present invention to the extent that various modifications can be made.

Claims (2)

Inputting the X coordinate and the Y coordinate when the touch panel is touched, Reading the X and Y coordinates again within 1-2 ms, Comparing an absolute value (X1-X2) and an absolute value (Y1-Y2) with a reference value _x and a reference value _y; If the absolute value (X1-X2) is larger than the reference value _x or the absolute value (Y1-Y2) is larger than the reference value _y, the step of checking, by increasing the Except value, checking whether the continuous splashing phenomenon occurs; If the Except value is 2, two consecutive bounces have occurred; setting 'X = 0' or 'Y = 0', If the absolute value (X1-X2) is less than the reference value _x or the absolute value (Y1-Y2) is less than the reference value _y, Except = 0, and the X and Y coordinate values are converted to X2 and Y2 coordinate values, respectively. Setting up, If the Except value is 2 and you set 'X = 0' or 'Y = 0', or if Except = 0 and the X and Y coordinate values are set to X2 and Y2 coordinate values, respectively, then "x_low <X <x_high and determining that y_low <Y <y_high ", x_low and y_low are taken as 0 or more test values, and x_high and y_high are used as 255 or test as appropriate values, If it is within the validity measurement range "x_low <X <x_high and y_low <Y <y_high", the touch-on / moving process is determined by the touch-on state, the sleep is maintained for a predetermined period of time (131), and the touch value is input again to receive the routine. Repeating, and if it is not within the validity measurement range "x_low <X <x_high and y_low <Y <y_high", determining that the touch is off Touch panel noise reduction method characterized in that consisting of. The method of claim 1, When the Except value is 1, it is determined that the popping phenomenon occurs once, and the touch panel noise removing method is characterized in that the touch value was not present at the end of the routine.

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